Electrolyte solution for high-capacity lithium-ion battery, preparation method and lithium-ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of electrolyte, can solve problems such as poor electrical contact between active materials and current collectors, hidden dangers in battery safety, and shedding of active materials, so as to achieve good shrinkage performance and alleviate battery performance deterioration , the effect of improving stability

A lithium-ion battery and electrolyte technology, which is applied in the field of electrolyte, can solve problems such as poor electrical contact between active materials and current collectors, hidden dangers in battery safety, and shedding of active materials, so as to achieve good shrinkage performance and alleviate battery performance deterioration , the effect of improving stability

CN104900916AInactive Publication Date: 2015-09-09GUANGZHOU TINCI MATERIALS TECH
6 Cites 73 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electrolyte solution for high-capacity lithium-ion battery, preparation method and lithium-ion battery
  • Electrolyte solution for high-capacity lithium-ion battery, preparation method and lithium-ion battery
  • Electrolyte solution for high-capacity lithium-ion battery, preparation method and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Battery production:

[0043] Positive electrode preparation: The ratio of positive electrode materials is: LiNi 0.8 co 0.15 Al 0.05 o 2 (lithium nickel cobalt aluminum oxide), acetylene black (conductive agent), polyvinylidene fluoride (PVDF, binder) mass ratio is 95:2.5:2.5. Add PVDF to N-methyl-pyrrolidone (NMP), stir evenly at a high speed, add acetylene black to the solution, stir evenly, then add lithium nickel cobalt aluminum oxygen and stir evenly to form a positive electrode slurry, and coat the positive electrode slurry with On the aluminum foil, the positive electrode sheet is baked, compacted, cut, and welded.

[0044] Negative electrode preparation: The ratio of negative electrode materials is silicon-carbon composite material, acetylene black, carboxymethyl cellulose (CMC), and propylene butyl rubber (SBR), with a mass ratio of 95:1.0:1.5:2.5. Add CMC to water, stir at high speed to dissolve completely, then add acetylene black, continue to stir until ...

Embodiment 2

[0048] Electrolyte A2 was prepared by using the electrolyte method in Example 1, except that the additives added were fluoroethylene carbonate, lithium tetrafluoroborate, succinonitrile, 1H,1H,5H-octafluoropentyl-1,1,2 , 2-tetrafluoroethyl ether, 18-crown-6, the added amount accounted for 4.0%, 0.5%, 2.0%, 4.0%, 0.5% of the total mass respectively. Among them, lithium hexafluorophosphate accounts for 14.0% (about 1.12mol / L) of the total mass of the electrolyte, and the remaining components are non-aqueous solvents.

[0049] S2 was prepared according to the method of Example 1 using the above electrolyte.

Embodiment 3

[0051] Electrolyte A3 was prepared by using the electrolyte method in Example 1, except that the additives added were fluoroethylene carbonate, lithium bisoxalate borate, adiponitrile, 2H-hexafluoropropyl 2,2,3,3-tetrafluoro Ether and 1-aza-15-crown-5 are added in an amount of 5.0%, 1.0%, 1.0%, 2.0%, and 0.5% of the total mass, respectively. Among them, lithium hexafluorophosphate accounts for 14.0% (about 1.12mol / L) of the total mass of the electrolyte, and the remaining components are non-aqueous solvents.

[0052] S3 was prepared according to the method of Example 1 using the above electrolyte.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an electrolyte solution for a high-capacity lithium-ion battery. The electrolyte solution includes non-aqueous solvent, lithium hexafluorophosphate, negative electrode film forming additive, positive electrode surface activity inhibiting additive and transition metal ion complexant; the negative electrode film forming additive includes organic ester negative electrode film forming additive of 1 to 10wt% of the total electrolyte solution and inorganic lithium salt negative electrode film forming additive of 0.5 to 2wt% of the total electrolyte solution; the positive electrode surface activity inhibiting additive includes fluorinated ether additive of 1 to 5wt% of the total electrolyte solution and nitrile additive of 0.1 to 5wt% of the total electrolyte solution; the transition metal ion complexant is of 0.1 to 1.0wt% of the total electrolyte solution. The electrolyte solution is adaptive to the high-capacity lithium-ion battery and is capable of optimizing the circulating performance and high-temperature storage performance of the lithium-ion battery. The invention further provides a preparation method of the electrolyte solution and the high-capacity lithium-ion battery adopting the electrolyte solution.

Description

technical field [0001] The invention relates to the field of electrolytic solutions, in particular to an electrolytic solution for high-capacity lithium-ion batteries, a method for preparing the electrolytic solution, and a lithium-ion battery using the electrolytic solution. Background technique [0002] Lithium-ion battery has been a research hotspot in the field of new energy since it came out in 1999. It is widely used in electronic products such as mobile phones, digital cameras and notebook computers due to its advantages of high voltage, large capacity, no memory effect and long life. In addition, lithium-ion batteries are also directly applied to electric vehicles and hybrid electric vehicles as energy storage devices for alternative energy sources. With the development of technology, the requirements for the energy density of lithium batteries are getting higher and higher. [0003] Among the most commonly used positive electrode materials at present, when the nic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
09 Sep 2015
Publication
CN104900916A
IPC
H01M10/0567; H01M10/058; H01M10/0525
CPC
H01M10/0525; H01M10/0567; H01M10/058; Y02E60/10; Y02P70/50
Inventors
θŒƒδΌŸθ΄ž; ζŽι’Š